[名词解释] low-density lipoprotein, LDL (低密度的脂蛋白)

COPⅠcoated vesicle (COPⅠ被膜小泡) COPⅡ coated vesicle （COPⅡ被膜小泡） clathrin-coated vesicle (披网格蛋白小泡) internal signal sequence (内含信号序列) start-transfer signal (起始转移信号) low-density lipoprotein, LDL (低密度的脂蛋白)